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I wonder about the technology used by the multitouch and the pens and brushes that are sold. Is this really high technology or can we build a pen for ipad ourself ?

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See a weird South Korean solution in this other thread:… – GEdgar Dec 3 '11 at 17:50
Also check Instructables! – koiyu Dec 10 '11 at 12:27

Well, looks interesting.

It seems that the ipad screen reacts to conductive surfaces, so if you can make one of those your point on a stylus, you're set.

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Here's a Walt MossPuppet video on making on a stylus out of a protein bar wrapper:

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